sir,

i dd buy an pci sata card and wdc cavier green wd5000aads 500gb sata hdd yesterday but when i setup my pci card and attach my hdd my pc(hard disk senital ) shows that my wdc hdd is operating at pio mode but in the device manager both primary and secondary channel show that currently operating at dma mode but the reading speed is very low of my wdc hdd i.e 3mb/sec and writing speed is ok i.e 17mb/sec i have tried alot to get this hdd working on udma mode but still no luck . so guys plz help to overcome this problem guys i forget to mention one thing that i also have seagate 160 gb sata hdd when i attach this to controller its works fine as it should be i.e 14mb/sec read speed and 14mb/sec write .

When you mention Primary and Secondary channels you are implying an ATA setup and not a SATA setup.

SATA runs on single channels and there are no primary nor secondary: just #1;2;3;4; etc.

Is the drive SATA II and if so is your motherboard SATA II?

guys my mother board is not sata II i am using an PCI sata converter on my ATA compatible motherboard and my hdd wd5000aads 500gb do know this is sata II or not but only this hard disk is creating problem i also have an other harddisk of seagate which is 160 gb and this one is working perfectly .

It most likely is SATA II if it is new. There should be a jumper on the rear to revert it to SATA I.

You can try that.

sir still mo luck not workig still on PIO mode.

I would suggest contacting Western Digital:

WD - Service & Support Home

Let us know how that goes.

guys they are good for nothing they said that send us the hdd and we will replace this but no solution for particular problem if this repeated then i will have to send the hdd again and wait for hdd for atleast 20 days

Sorry I know of nothing else to suggest.